import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class WarningDialog extends JDialog implements ActionListener {
  private JTextField warningField = new JTextField(20);
  private JButton ok = new JButton("OK");
  private JPanel p = new JPanel();
  
  public WarningDialog(JFrame owner, String warning) {
    super(owner, true); // must be the first statement in constructor
    			// "true" provides "modal dialog feature"
										
    warningField.setText(warning);
    p.add(warningField);
    ok.addActionListener(this);
    p.add(ok);
    getContentPane().add(p);
    
    // not really necessary here
    addWindowListener( new WindowAdapter() {
      /* public void windowClosing(WindowEvent e) {
        setVisible(false);
        dispose();
      } */
    }); 
    
    setTitle("  Warning");
    setSize(300,100);
    setLocation(150,150);
    
  } // WarningDialog()
  
  //the Dialog is closed only by pushing the Ok Button
  public void actionPerformed(ActionEvent e) {
     String command = e.getActionCommand();
     if (command.equals("OK")) {
       setVisible(false);
     }
  } //actionPerformed
  
} // WarningDialog